And Mourinho said: "I think Mr Taylor is a very good referee but I think somebody with intention is putting such a pressure on him that I feel that it will be difficult for him to have a very good performance.

New rules were introduced in 2009 in an attempt to crack down on pre-match comments about officials which could be viewed as intimidatory or influential.

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In its statement at the time, the FA said: "Clubs are being advised that any media comments by managers, players or any other club officials relating to appointed match officials prior to a fixture will no longer be allowed - such pre-match comments will be deemed improper and dealt with accordingly."

The FA, having considered his comments, has now asked the United boss for his thoughts as the next part of the process. The Portuguese has until the close of business on Friday to respond.

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Anthony Taylor took charge of Liverpool v Manchester United last night

"Can I speak about the referee without being punished?" he asked the club's press officer.

After being given the go-ahead he added: "He had a good game and I am happy for him because people with responsibilities put a lot of pressure on him and it was very difficult for him to have a good performance, which he had."